The number of molecules present in a drop of water. If is volume is 0.05 ml are
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volume = 0.05 ml = 0.00005L
density of water = 1000g/l
density = mass/volume
mass = density*volume
= 1000*0.00005
=0.05 g
molecular weight of water = 18g
no of moles of water = mass/molecular weight
= 0.05/18=0.027 moles
no of molecules = 0.027 * 6.022 * 10^23
=0.016*10^23 molecules are present in one drop of water
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